package com.usian.admin.gateway.filter;

import com.usian.admin.gateway.utlis.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import java.util.List;
import java.util.function.Consumer;

@Component
public class TokenFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        if (request.getPath().value().contains("/login/in")){
            return chain.filter(exchange);
        }
        HttpHeaders headers = request.getHeaders();
        List<String> tokens = headers.get("token");
        if (tokens==null||tokens.size()==0||StringUtils.isBlank(tokens.get(0))){
            String json="{\"errorMsg\":\"dont have token\"}";
            return response.writeWith(Flux.just(response.bufferFactory().wrap(json.getBytes())));
        }
        try {
            String token=tokens.get(0);
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int i = AppJwtUtil.verifyToken(claimsBody);
            if (i==0||i==-1){
                Integer id = (Integer) claimsBody.get("id");
                ServerHttpRequest serviceHttpRequest = request.mutate().headers(httpHeaders -> httpHeaders.add("userId", id + "")).build();
                exchange.mutate().request(serviceHttpRequest).build();
            }else {
                String json="{\"errorMsg\":\"token is invalid\"}";
                return response.writeWith(Flux.just(response.bufferFactory().wrap(json.getBytes())));
            }
        }catch (Exception e){
            String json="{\"errorMsg\":\"token is invalid\"}";
            return response.writeWith(Flux.just(response.bufferFactory().wrap(json.getBytes())));
        }

        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
